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RISS 인기검색어
- 검색키워드
- 저자 : Kearby, Kenneth Karl (검색결과 1 건)
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A Study of the Effect of the Surface of a Catalyst on Dehydrations in the Vapor Phase
Kearby, Kenneth Karl ProQuest Dissertations & Theses University of Illi 1937 해외박사(DDOD)
The porous structure of gels has long made them seem attractive as catalyats. Probably due to the relatively high coat of moat gels, silica gel is the only one used extensively in catalytic work, and it is used in general only aa a support for other catalysts, for example platinum. The discovery of aerogels was announced by Kistler in 1932 in a paper describing their preparation and properties. Inasmuch as the aerogel is five to ten times more porous than the ordinary gel, one would expect it to be an even better catalyst than the xerogel (the ordinary dried gel). This point of view was adopted by Kistler, Swann, and Appel who pointed out that the aerogel probably has a greater surface area per unit of mass than any other solid available for catalysis. They also pointed out the accessibility of the surface is a maximum because the distances between surfaces in the solid structure are sufficiently large to make capillary condensation negligible and permit rapid diffusion of the reactants through it, while at the same time being sufficiently small for a gas molecule passing through the solid structure to undergo a maximum number of collisions with the surfaces. (Shortened by ProQuest.).
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